Predictive accuracy of BIA equations for estimating fat-free mass of black men
Abstract
This study assessed the predictive accuracy of previously published bioelectrical impedence analysis (BIA) equations in estimating the fat-free mass (FFM) of black men, 19 to 50 years. The reference method was hydrostatic weighing (HW) at residual lung volume. Body density (Db) was converted to relative body fat (%BF) for calculation of FFMHW using the Schutte et al. equation. Resistance and reactance were measured with a Valhalla bioimpedance analyzer. Age-specific, generalized, and fatness-specific BIA equations were cross validated using regression analysis. The Segal fatness-specific equations were modified using a method recommended by Stolarczyk. All of the equations significantly (P < 0.05) underestimated the average reference measure of FFMHW. However, the underestimation of FFM for the modified Segal fatness-specific equation was relatively small (-1.8 kg) and not likely to have much clinical significance. Furthermore, this equation had a high correlation with reference FFMHW (ry,y' = 0.97), low prediction errors (SEE = 2.1 kg; E = 2.7 kg), and accurately estimated the FFM within +/- 3.5 kg for 78% of the individuals in the sample. Thus, we recommend using the modified fatness-specific BIA equation for estimating the FFM of black men.
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- Authors
- WAGNER, D. R., HEYWARD, V. H., KOCINA, P. S., STOLARCZYK, L. M., & WILSON, W. L.
- Affiliations
- University of New Mexico (US)
- ORCID
- WAGNER, DALE R.
- Venue
- Medicine & Science in Sports & Exercise
- Published
- 1997-07
- Volume
- 29
- Issue
- 7
- Pages
- 969-974
- ISSN
- 0195-9131 (ISSN-L)
- OpenAlex
- W2034936811
- Cited by
- 23
- References
- 25
- Citations by year
- 2021: 2 · 2016: 1 · 2013: 1
- FWCI
- 1.35
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Medicine & Science in Sports & Exercise (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Physiology › Body Composition Measurement Techniques
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Electrical and Bioimpedance Tomography
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Obesity, Physical Activity, Diet
- Keywords
- bioelectrical impedance analysis, fat-free mass, Black men, underestimation, prediction accuracy, hydrostatic weighing, body composition, resistance and reactance
- MeSH terms
- Adult, Body Composition, Densitometry, Humans, Male, Mathematical Computing, Middle Aged, Reproducibility of Results, Electric Impedance
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